1 // SPDX-License-Identifier: GPL-2.0-only
4 * Copyright (C) 2011 Gabor Juhos <juhosg@openwrt.org>
5 * Copyright (C) 2013 John Crispin <john@phrozen.org>
8 #include <linux/kernel.h>
9 #include <linux/init.h>
10 #include <linux/export.h>
11 #include <linux/clkdev.h>
12 #include <linux/clk.h>
13 #include <linux/clk-provider.h>
14 #include <asm/mach-ralink/ralink_regs.h>
20 static const char *clk_cpu(int *idx)
25 return "ralink,rt2880-sysc";
28 return "ralink,rt3883-sysc";
29 case RT305X_SOC_RT3050:
31 return "ralink,rt3050-sysc";
32 case RT305X_SOC_RT3052:
34 return "ralink,rt3052-sysc";
35 case RT305X_SOC_RT3350:
37 return "ralink,rt3350-sysc";
38 case RT305X_SOC_RT3352:
40 return "ralink,rt3352-sysc";
41 case RT305X_SOC_RT5350:
43 return "ralink,rt5350-sysc";
44 case MT762X_SOC_MT7620A:
46 return "ralink,mt7620-sysc";
47 case MT762X_SOC_MT7620N:
49 return "ralink,mt7620-sysc";
50 case MT762X_SOC_MT7628AN:
52 return "ralink,mt7628-sysc";
53 case MT762X_SOC_MT7688:
55 return "ralink,mt7688-sysc";
62 void __init plat_time_init(void)
64 struct of_phandle_args clkspec;
65 const char *compatible;
71 compatible = clk_cpu(&cpu_clk_idx);
72 if (cpu_clk_idx == -1)
73 panic("unable to get CPU clock index");
76 clkspec.np = of_find_compatible_node(NULL, NULL, compatible);
77 clkspec.args_count = 1;
78 clkspec.args[0] = cpu_clk_idx;
79 clk = of_clk_get_from_provider(&clkspec);
81 panic("unable to get CPU clock, err=%ld", PTR_ERR(clk));
82 pr_info("CPU Clock: %ldMHz\n", clk_get_rate(clk) / 1000000);
83 mips_hpt_frequency = clk_get_rate(clk) / 2;